Adjustable centering for concrete floor constructions.



G. B. WAITE.

ADJUSTABLE ENTEmNG EoR CONCRETE noos coNsTRucnoNs.

APPLICATION FILED JULYIT, 1914.

Patented Mar. 21, 1916.

2 SHEETSSHEET l.

lll/1111111111 G. B. WAITE.

ADJUSTABLE CENTERING FOR CONCRETE FLOOR CONSTRUCTIONS.

APPLICATION FILED 1ULYI7| I9I4.

Patented Mar. 21, 1916.

2 SHEETS-SHEET 2.

WHA

Ill/111111111 OOO IIIIIIIIII GUY B. WAITE, 0F NEW YORK, N. Y.

ADJUSTABLE CENTEBING FOR CONCRETE lFILOOR. CONSTRUCTIONS.

specification of Letters Patent. f Patented Mar, 21, 1916,

.application med :ruiy 17, 1914. serial Nb. 851,436.

new and useful Improvements in Adjustable Centerings for Concrete Floor Constructions, of which the following is a specification.

One of the main objects of this invention is to provide an adjustable oor centering adapted to be manufactured in quantities of standard sizes and lengths, and which may be readily assembled and adjusted to t either between or under the supporting girders of the floor.

Another of the objects of this invention is to provide a centering for a floor construction which may be readily adjusted to the varying spaces between supporting girders.

There are other important objects and advantages of the invention all of which will more fully hereinafter appear.l

In the drawing, Figure 1 is a sectional view of a portion of a reinforced concrete floor showing one form of the floor centering in position; Fig. 2 a sectional View on the line II--II of Fig. 1; the concrete being omitted; Fig. 3 a bottom view of the centering shown in Fig. 1; Fig. 4 a detail inverted perspective view of one member of the centering shown in Fig. 3; Fig. 5 a similar view of the other member of the centering shown in Fig. 3; Fig. 6 a sectional view on the line VI-VI of Fig. 1; Fig. 7 a sectional view showing a slightly different arrange-` ment of parts; Fig. 8 a transverse section of a series of floor girders showing a slightly different form of centering supported thereby; Fig. 9 a side elevation ofa portion of one girder, the supported centering being shown in end View; Fig. 10 a transverse sectional view of the centering shown in Fig. 8; Fig. 11 a View similar to Fig. 10 with a bridging plate of the same construction as that shown in Fig. 7 Fig. 12 a transverse sectional view showing the bridging plate arranged at the lower edges of the centering to produce a paneled effect in the ceiling; and Fig. 13 a detail perspective view of a portion of a centering support formed with anges adapted to bridge the space between the centering elements. Fig. 14 al detail transverse sectional view showing the centering forms arranged close together, the section being taken through the outer memberof the centering; and Fig.v 15 a view similar to Fig. 14, the section being taken through the inner member of the centering.

Referring to the various parts of the construction vshown in Figs. 1 to 7, l designates the supporting girders, 2 the concrete molded around said girders and 3 the concrete Hoor.

The girder centering is fully described in my co-pending application Serial No. 851,455, led July 17, 1914, and will not be particularly described herein, but briefly it consists of sheet' metal troughs 4 provided with reinforcing strip's 5 and yokes 6. These troughs with their supporting yokes are supported over the girder by means of wire loops 7 and pins 8. As fully described in my aforesaid co-pending application the girder centering is adjustable to adapt it for various lengths of girders.

The floor centering as shownin Fig. 1 is arranged to bridge the space between the girder centering and to form the floor support. This centering is adjustable to adapt it to the varying widths of vthe spaces between the supporting girders, or to the varying spans between girders, and consists of two inverted sheet channel sections 9 and 10, section 10 sliding within section 9, the latter section being considerably longer than section 10. These sections may be of any suitable dimensions in cross section and the depending flanges may be of suitable width `to give the sections the required strength' and stiffness. Secured to the depending side flanges of the section 10 are wooden brace side flanges of the section 9, as shown 11. To the outer end of each of the sections 9 a'nvd 10 is secured a depending hook 15 which is adapted to engage over the upper edge of one of the reinforcing strips 5 connected to the girder centering 4. By this means the floor centering is supported at each of its ends by the girder centering and the two members of the ioor centering may be adjusted .on each other' to adapt the centering for the Varying spans between the girders. The overlappin ends bf the sections 9 and 10 are broug t into very close contact, aswll be readily understood, so that concrete will not find its way between the sections at said overlapping ends.

The floor centering elements or units made of the two sections 9 and 10 are placed suitable distances apart, as shown in Fig. 2 and the spaces between said centering'elements are bridged by sheet metal plates 16 which rest on the top of adjoining elements or units. In order that the upper members of the sections 9 and 10 shallclosely engage the troughs 4 the said upper surfaces are projected beyond the side flanges as shown at 17 in Figs. 4 and 5. This is also clearly shown in Fig. 1.

Instead of employing flat plates 16 to y bridge the spaces between the centering elements, flange .plates 18 may be used, the depending flanges 19 of said plates being engaged by straps 20 secured to the sides of the sections 9 and 10. .If desired these straps 2O may be extended below the side flanges of the sections 9 and 10 and may be perforated to receive the pins 14. By this means said pins are given two points of support, as shown clearly in Figs. 2 and 7.

From the foregoing it is manifest that in Figs. 1 to 7 inclusive, I have shown an adjustable floor centering which may be readily adapted to spans of different widths and in which the supporting elements may be arranged side by side and spaced suitable distances apart to cover the floor space between the girders.

In Figs. 8 to 11 inclusive I have shown a slightly different form of centering. In these views the centering members consist of sheet metal channels or inverted troughs 21 and 22, the troughs 22 tting inside of the troughs 21 as shown clearly in Fig. 10. These sliding members are interlocked at their ends by means of cross-bars or pins 23 which pass through depending straps 24 secured to the sides of the members 2'1. The cross-bars 23 are bent to form the angle 23 approximately midway its ends. This angle is adapted to bear against the inner member ed longitudinally the cross-bar 23 1s turned floor space.

to bring the angle 23 against the inner surfaceof the member 22. The openings in the straps 24 are so -located that when the crossbars are turned upwardly 'the `serve as cams to draw the two meinbers'ofy the centering together. The cross-bars engagethe lower edges of the side flanges of the centering member and force said centering member upwardly against the center surface of the outer member. When it is desiredto separate 'the two members, the cross-bars are turned ldownwardly to the position shown in dotted lines in Fig. 10. As shown in Figs. 8 and 9 this form of floor centering is suspended from the girders by means of hangers 26, said han ers being provided at their lower ends wit hooks 27 which en gage under the lower edges of the side flanges of the troughs 22. As'shown in Fig.

8 this floor centering is supported below the girders and is continuous throughout the It is manifest, however, that the same form of centering may be used to span the. space between the girders, in the manner of the centering illustrated in Fig. 1. When it is desired to form a fiat ceiling, bridge plates 28 may be used to span the spaces between the centering elements, as shown in Fig. 9, said plates restingupon the upper surfaces of the members 21 and 22. Ifdesired the straps 24 may be continued upwardly and formed into hooks 29, and the bridge plates may be formed with depending flanges 30 adapted to engage the hooks 29, as shown in Fig. 11.

When it is desired to form a panele'dv ceiling, that is to say a ceiling with depending.

ribs, the bridge plates may be supported on the ends of the bars 23 as shown at 31 in Fig. 12. In this construction the bridge plates are supported at the lower edges of the centering elements instead of being supported on the vupper surfaces thereof. In this arrangement of the parts the concrete fills the spaces between the centering elements and gives to the ceiling the ribbed or aneled eii'ect.

nstead of using the bridge plates 31 the centering elements 21a and 22a may be formed at their lower'edges with outwardly extending flanges 32 which are adapted to bridge the space between the centering elements and serve the same purpose as the bridge plate 31. In this form of the Acentering elements the flanges 32 may be perforated and the two parts secured together in their adjusted position by means of wire or other securing means 33, as shown clearly in Figs. 1 and 3.

If it be desired, the centering forms may be arranged close together, as shown in Figs. 14 and 15, thereby dispensing with the use of the bridge pieces between the forms.

In this arrangement of the forms hooks or Lirama clips 34 Aare employed as shown in .these figures. The hooks carried by the outer members 21 of the centering, are `secured to the outer sides of the depending side ianges, as shown in Fig. 14. The hooks 34;, carried by the inner members of the centering, are secured to the inner sides of the side flanges, as shown in Fig. 15. By arranging the hooks as described, they will not interfere with the longitudinal adjustment of the centering member. In this arrangement of the centering'one set of hangersgieed only be used for each set of centering forms, hooks 34 servingvtb support the adjoining centering forms. As shown in Figs. 14 and 15 the hangers are arranged between the centering forms, there being sufficient space between the forms to receive them.

From the foregoin it lis clear that both forms of centering s own in thedrawings may be re/duced to small dimensions and arranged in comparatively small packages or bundles for convenience in transportation and storage.

The parts being made of sheet metal, are durable and may be used over and over again, making it desirable to transport them from place to place for use and to store them when not in use. lt is also a great advantage to provide a centering which may be placed in position without the necessity of driving nails or screws through any of the wooden parts thereof. A wooden centering is soon destroyed, and practically, it cannot be used but once.

What l claim is:

1. A centering for concrete floor construction comprising two inverted channel sections adapted to slide on each other so that said centering may be shortened or lengthened, means for interlocking the ends .of said sliding sections said means servin to clamp the two sections together against ongitudinal movement.

2. A centering for concrete floor construction comprising two sheet metal channel sections fitting one within the other and adapted to slide on each other so that said centering may be shortened or lengthened, a rotatable angular cross-bar carried by one of said sections and adapted to interlock and clamp the inner ends of said sections together.

3. A centering for concrete floor construction comprising inverted sheet metal channel sections, means for suspendingsaid channel sections from girders with spaces between the ends of adjoining sections, inverted channel sections fitting over the suspended sections and bridging the spaces between said suspended sections, and means for clamping together the suspended sections and bridgin sections.

4. A centering or concrete floor construction comprising inverted sheet metal channel sections, means for suspending said channel sections' from girders with spaces between the ends of adjoining sections, inverted channel sections fitting over the suspended sections and bridging the spaces between said suspendedsections, and means carried by the bridging sections and engaging the ends of the suspended sections to i clamp said sections together.

5. A centering for concrete ioor construction comprising a series of parallel centering elements located a suitable distance apart,

each element consisting of sheet metal inverted channel sections, means for suspending said channel sections from girders, sheet metal inverted channel sections bridging the spaces between the ends of adjoining suspended sections, means for clamping together suspended sections and the bridging sections, and bridging plates supported by and extending across the spaces between the centering elements.

6. A centering for concrete floor construction consisting of inverted channel sections adapted to slide on each other so that said centering may be shortened or lengthened, means for ysuspending said centering from girders, and means for interlocking the ends of said sliding sections to hold said sections against longitudinal movement.

7. A centering for concrete iloor construction consisting ofa series of parallel centering elements located a suitable distance apart, each element comprising vinverted sheet metal channel sections adapted to slide on each other so that said centering elements may be shortened or lengthened, means for clamping together the said sliding sections against longitudinal movement, and bridg- `ing plates carried by and extending across the spaces between the centering elements.

8. A centering for concrete floor construction comprising a series of parallel centering elements each element consisting of sheet metal inverted channel sections, means for suspending certain of said channel sections, inverted sheet metal channel sections supported by and bridging the spaces between the ends of adjoining suspended sections, and transversely extending clamping and locking means carried by the bridging sections and engaging the under side of the suspended sections to clamp the two sections together against longitudinal movement.

9. A centering for concrete iloor construction comprising a seriesof parallel centering elements located a suitable distance apart, each element consisting of sheetmetal inverted channel sections, means for suspending said sections, inverted sheet metal channel sections supported by and bridging the spaces between the ends of adjoining suspended sections, transversely extending clamping and locking means carried by the In testimony whereof I hereunto aix my bridging sections and engaging the under signature in the presence of two witnesses.

side of the suspended sectlons to clamp the A two sections together against longitudinal y v GUY B `5 movement, and bridging plates suspended by Witnesses:

and extending across the spaces between the .LILLIAN MCGUIRE,

MINERVA VAN ALEN.

centering elements. 

